Karol Staniszewski, 27, is feared to have become disorientated when he took a huge dose of anti-histamine after splitting up with his girlfriend.

His body was found at a beauty spot in June this year following a three day search of woodland near his home by the River Irwell, in Salford, Greater Manchester.

At his inquest coroner Prof Jennifer Leeming warned about the dangers of taking large quantities of the anti histamine after it was revealed Mr Staniszewski had swallowed 45 times the recommended level of Diphenhydramine.

River Irwell, The Cliff in Higher Broughton, Salford.(Picture: Cavendish Press)

The hearing was told Mr Staniszewski, who worked at the Cabana Brazilian restaurant in Manchester had been living with his brother Marek since 2016 after moving from Poland to London in 2011.

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He had been in a relationship with the sister of Marek’s girlfriend but they split up and she started dating some else.

Marek told the inquest: ‘It was her decision and a few weeks later she started seeing a man at work. Karol was upset, but as my girlfriend and I were due to be married I asked Karol to keep on good terms with her as we would all be family shortly.

‘He had had previous girlfriends and split up with them but he had always got over it. He never self harmed or spoke about suicide.

‘We would always speak if something was on his mind and he would tell me what was wrong.

‘On the Friday at 6pm she went round to the house to pick up her belongings and Karol was there having finished work at around 3pm.

‘I know when he came home he had a shower. His ex was only in the house for around five minutes but he was still upset and told her to go away and that he didn’t want to see her. He then went into his room for around 10 -15 minutes.

‘My girlfriend told me about this when I got home. He left the house at 5:50pm and didn’t say where he was going or what he was doing.

‘At around 6:50pm I got a text from him saying ‘I’m sorry my brother I have to do something for myself.’ I replied, and the last reply I got from him was ‘I have been and I have gone’.

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‘I text him and called him but he didn’t reply. His phone was turned off around 11pm. I left him a message saying that I was calling the police.

When he didn’t return home Friday evening I called the police and reported him missing, giving them a photo of him.

‘I want to know what happened to him after he left the house because I do not believe that he took his own life.

‘He was looking forward to my wedding in Poland to seeing friends there again. We were so close and his death has created a huge void.

The entrance to the beauty spot by the River Irwell (Picture: Cavendish Press)

‘Karol did walk in the park but he never went near the river. He never fished or anything so there was no reason for him to be there.

‘I have only one brother. It doesn’t make sense, the only person that knows what happened is him. He just knows, no one else. I thought he was the strong one, that he was stronger than me. I don’t know why he has done this.’

‘He certainly bought and took a significantly excessive amount of medication – but it is not a medication that you routinely think would end your life and there is some doubt as to whether he went into the river deliberately.

‘He took this medication and it had a soporific and disorientating effect – that doesn’t exclude the possibility that he fell in the river.

‘It is also possible that he took too much medication as a demonstration of how bad he was feeling, as a cry for help.

‘I suppose the lesson we should learn is the dangers of taking more than the stated dose of any medication. It is dangerous to take more that the stated dose of any medication, even those medications that are not commonly associated with an overdose causing death.’